package com.nowcoder.community.entity;

import lombok.Data;

@Data
public class Page {
    private int current = 1; // 当前页
    private int limit = 10;
    private int rows;
    private String path;

    public int getCurrent() {
        return current;
    }

    public void setCurrent(int current) {
        if (current >= 1){
            this.current = current;
        }
    }

    public int getLimit() {
        return limit;
    }

    public void setLimit(int limit) {
        if (limit >= 1 && limit <= 100){
            this.limit = limit;
        }
    }

    public int getRows() {
        return rows;
    }

    public void setRows(int rows) {
            this.rows = rows;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    // 总页数
    public int getTotal() {
        if (rows % limit == 0)
            return rows / limit;
        else
            return rows / limit + 1;
    }

    public int getFrom(){
        int from = current - 2;
        return from >= 1 ? from : 1;
    }

    public int getTo(){
        int to = current + 2;
        int total = getTotal();
        return to <= total ? to : total;
    }

    // 当前页起始偏移量
    public int getOffset(){
        return current * limit - limit;
    }
}
